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Yes, you can use the USB port to output video separate from and addition to the HDMI port on the adapter. For example, I have an iPad acting as an additional display with the iPad's Lightening to USB cable plugged into the USB port on the adapter, while the HDMI port is driving a HDTV. See the iOS APP Store for Duet. You will also need to install the (not on App Store) Duet app on the MacBook. Other USB to HDMI cables/converters/adapters should also work.